I LOVE MARIO'S! I visit Pittsburgh at least once a year and I make sure to visit this spot every time!
The staff are awesome and personable! Even when it's super busy, you can still get a drink in reasonable time!
I like how there are levels that welcome smoking and other ones that do not. (I'm a non-smoker and appreciate this quality!)
It gets rowdy there, but that's part of the South Side fun!